(19)
(11) EP 0 370 670 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
26.01.1994 Bulletin 1994/04

(43) Date of publication A2:
30.05.1990 Bulletin 1990/22

(21) Application number: 89311714.3

(22) Date of filing: 13.11.1989
(51) International Patent Classification (IPC)5: G11B 27/029, G11B 15/18
(84) Designated Contracting States:
DE FR GB

(30) Priority: 22.11.1988 JP 295270/88

(71) Applicant: SONY CORPORATION
Tokyo 141 (JP)

(72) Inventor:
  • Yamashita, Keitaro
    Shinagawa-ku Tokyo (JP)

(74) Representative: Ayers, Martyn Lewis Stanley 
J.A. KEMP & CO. 14 South Square Gray's Inn
London WC1R 5LX
London WC1R 5LX (GB)


(56) References cited: : 
   
       


    (54) Rotary head type recording apparatus


    (57) A video tape recording apparatus having a tape guide drum with a cylindrical outer surface for guiding a magnetic tape in a helical fashion on the outer surface, and a pair of rotary magnetic heads rotating at a predetermined speed and provided in association with the tape guide drum for scanning skewed parallel tracks on the magnetic tape is specially adapted to perform after-recording or dubbing. Each of the tracks is formed having a length to accommodate a pair of audio portions and a centre video portion provided between the pair of audio portions. Rotational angles of the rotary magnetic heads corresponding to the length of the audio portions and the centre video portion are expressed as follows,
    ϑa + ϑv = ϑb + ϑv = 180o
    where ϑa and ϑb correspond to the audio portions and ϑv corresponds to the centre video portion, respectively. In the case of audio after-recording, selected audio portions are left blank during the initial recording operation and an after-recording audio signal is recorded therein at a late time.







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